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Armstrong water pump 20 hp

# 4280 BF 4x3x13 this is one of two pumps that are running until end of month then other one runs. two replacement motors through the years
now I have a seal out leaking water mix. Before I would use angled steel and get behind impeller and move it off of keyed shaft,I am thinking differently now and do not want to warp impeller. 5 1/2 inch opening. I have motor and part of pump assy to get apart. I thought about an inside puller but not in this small itty bitty Town any suggestions.